Choke valve for carburetor



Aug. 16, 1932. D. COLE CHOKE VAN [E FOR CARBURETORS Filed Dec. 15, 1930 INVENTOR. 00/7 60/2 Patented-Aim. 16, 1932;

- UNITED TA -Es non 001.3, or nvnzs'ron, ILLINOIS cnoxn vaL'vn FOR eannoaaron This inventionrelates to carburetor choke valves and has for its principal object the provision of an air valve that will automatically open with the air flow through the carburetor. p

Another object of the invention is to provide an automatic choke valve that will impose a very slight restrictionto the air entermg the carburetor while the valve is in its wide-open position.

Another ob'ect of the invention is to provide an automatic choke valve in which the component parts do not require extreme accuracy in their manufacture. l5 An important feature of the inventionrelates "to t e arrangement of the spring loaded secondar valve which is mounted on the main va ve shaft within an aperture formed n the main valve and comprising two openmgs located respectively above and below the shaft. The secondary valve is preferably laterally guided by the sides of the aperture and has flat .faced rojections on opposite 4 sides of the shaft whlchfcontact with the face of the main valve to seal the openings. The flat faces overlap the opening and obviate the necessity of accurately/forming the openings except at the sides, where careshould be used to have the main valve closely fitted about the 80 central bearing portion of the secondary valve. I

Other objects and features of the invention will be apparent from the following description of one embodiment thereof which I 36 have illustrated in the accompanying drawing in which:

' igure 1' is a side elevation of a carburetor having a portion of the air horn broken away to show the improved choke valve installed therein; a

Figure 2.is an enlarged view of a portion of the air hornandchoke valve, illustrating two operative positions of the valve; and

Figure 3 is a view showing the valve as viewed from the entrance to the air horn.

In the drawing 10 is a carburetor having a float chamber 12 and an attaching flange 14 for securing it to an engine manifold (not shown). The main air supply of the car- 6 buretor is taken through air horn 16 within Application filed December 15, 1980. Serial No.

which is pivotally mounted a choke valve 18 having an operating shaft 20 which may be rotated by lever 22 for securing the desired adjustment. Valve 18 has an aperture 24 formed in its mid-portion and formin openings above and below the shaft. Wit in the aperture 24 is a secondary valve 26 rotatable upon the main shaft 20. A spring member 28 is secured to the main valve 18 at one end and has its opposite end tensioned against the lower portlon of secondary valve 26 in sliding contact therewith.

Bearing portion 30 of valve 26, is preferably of substantially the same width as the distance between the two parallel sides of the aperture 24 and closely contacts therewith to laterally position the secondary valve on the shaft and to prevent leakage of air between a the main and secondary valves adjacent the shaft. I a

Valve26 is rovided with opposite extensions having at faces 32 and 34 which contact with opposite'sides of the valve 18 and seal the openings above and below the shaft. The fiat faced portions of secondary .valve 75 26 are preferably larger than the openings in the main valve whereby the openlngs are sealed by the contact of the flat faces and no care need 'be used to accurately form the openings. f

The opening above the shaft is constructed of less area than the opening'below the shaft in order that pressure will be unbalanced about the axis and cause the secondary valve to assume a position similar to that shown in full lines inFigure 2 when valve 18 is closed and the motor is running. v i f In the operation of the device, the main choke valve '18 is manually closed by moving the lever 22 through any desired-connection, co to the fullclosed position shown by, full lines in Figure 2; The engine (not shown) is then i cranked in the u al manner and upon starting draws air through the horn 16 and opens the spring loaded secondary valve 26 to the C5 desired degree which will be proportionate to the amount of the iuflowingair.

After the engine has run for ashort time and has been heated sufliciently to no longer require an air restriction, the main choke 1 gard the inventionsas limited to the form ally operable vafve, a valve operati shown or described or otherwise except by the terms of the following claims.

I claim:

1. A carburetor choke comprising a manu- I a valve I ally operable valve having an o nin operating shaft, and a s ring Ydaded second-.- ary valve rotatable on e shaft for controlling said opening and movable to open position when the manually operable .valve is closed; p M 2. A carburetor choke comprising a manually operable valve, a valve openin shaft, said valve having an openingexten 'ng on both sides of the shaft, and a sprin loaded seconds. valve rotatably moun shaft within said opening for closing the same, the opening on one side of the shaft having a less area than the opening on the other side of the shaft,

3. A carburetor choke comprising a manusaid valve having an opening 0" n ng on both sides of the shaft, and a seconds valve rotatably mounted on the shaft withm said I tion to the ends 0 I ing portion colitac opening, a spring coactin between the valves shaft, and an unbalance aperture, said secondary valve having oppositely extending portions of different area ada ted to simultaneously contact with 3)- posite sides of the main valve for closing e aperture. F

7. A carburetor choke coigprising a manually operable disc valve fix having an, aperture therein constituting two openings disposed on op its sides of the pressure actuated secondary valve rotatable on the shaft and having oppositely extending-portions of different area designed to close the openings. In testimony whereof, I have hereof signed myname.

- r on COLE.

on the shaft, 1

to urge them to ether, an the openin on one a side of the aha having a less area t an the opening on the other side of the shaft.

4. A carburetor choke comprising a manually operable valve having an aperture with parallel sides and comprising two openin and a secondary valve rotatable within t e alperture having a bearing porticn contacting t e sides of the aperture and in spaced relathe openings, 'said secondary valve having flat faces adapted to contact 311: main valve and 010% the end portions of o I l l L r 6. ca uretorchoke comprising a manus ally operable disc valve having an aperture with parallel sides and comprism two openmgs, and a spring-loaded seeon ary valve rotatable within theaperture ha a bear the sidesof t e a 4 ture andin spaced re ation to the ends 0 the openings, and secondary valve having flat faces adapted tocontactthe disc valve and .f

close the end portions of theopenin 6. A carburetor choke comprising' rmanually operable valve having an aperture, and

- a spring loaded secondary valve rotatable on the same as the main valve within the to a shaft and I 

